Poppet valve assembling tool



Jan. 13, 1948. N, B, COOK 2,434,456

. POPPET VALVE ASSEMBLING TOOL Original Filed May 9, 1944 FT .1. El /'0 v 444? 47 AZ /2 /8 /5 A9 24 M: f 4 k O" y g Q a 9 3 W 71%? W Patented Jan. 13, 1948 POPPET VALVE ASSEMBLING TOOL Nathan B. Cook, Syracuse, N. Y.

Original application May 9, 1944, Serial No.

534,753. Divided and this application February 10, 1945, Serial No. 577,215

1 Claim.

This invention has for its object a tool for assembling or reassembling the valves, springs and abutments in the heads of internal combustion engines, operable to depress the spring abutment against the spring and move valve looks or lock members into interlocking coaction with the valve stem. It is particularly adapted for overhead valves, such as the type used in the engines of Chevrolet cars, trucks, etc.

The invention is shown as embodied as a unit with the tool for disassembling or releasing the valves of the valve springs preliminary to removing the valves.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

This application is a division of my application Serial No. 534,753, filed May 9, 1944, for Poppet valve tool.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a view showing the use of the assembling tool of the unit, the tool being shown in starting position.

Figure 2 is a View similar to Figure 1 showing the assembling tool of the unit at the time the parts are assembled.

The valve has the usual stem 2 mounted in any suitable manner in the head 3 of an automotive engine. 4 is a spring abutment on the stem and locked thereto by lock members 5; and 6 is a spring thrusting in one direction against the cylinder head 3 in any well known manner and against the spring abutment 4. The spring abutment of this type is formed with a conical recess about the stem in which the lock members 5 are located. These lock members are arcuate or semi-circular in cross-section with their outer surface conical to conform to the conical walls of the recess. They are formed on their inner sides with ribs 8 which interlock in a circumferential groove 9 in the upper end of the stem 2. This is the conventional construction and forms no part of the invention.

The invention resides in the tool for assembling the valve spring, spring abutment and locks or look members. The head [2 is used to reassemble the abutment, spring and lock members on the valve stem, after the valve is placed in the cylinder head. The head I2 is undivided and rigid on the end of a shank l0 and is formed with a socket or bore I! for receiving the end of the valve stem and with a counter bore l8 and with means operable to (1) depress the abutment against its spring and move the locking members into position wherein the ribs 8 are alined with the groove 9 in the valve stem, and (2) move the locking members radially and interlock the ribs 8 in the groove 9; this means being specifically the counter bore 18 having a conical or cam shaped bottom wall l9. The end of the head around the counter bore forms a bearing surface at 20 to be pressed against the abutment 4, as seen in Figure 1, after the lock members 5 have been located partly in the recess of the abutment but are out of or above interlocking engagement with the groove 9 in the valve stem. Now upon force being applied to the tool to depress the head [2, the abutment 4 is depressed, compressing the spring 6 and the conical bottom IB of the counter bore presses against the upper edges of the lock members 5 forcing them also axially along the valve stem until the lock members or the ribs 8 thereon become alined with the groove 9 of the stem, where further depression earns the lock members radially inward, causing the ribs 8 to interlock in the groove 9. The tool can then be removed. The end of the valve stem 2 enters an axial bore I! at the apex of the conical bore I8 when the head [2 is fully depressed.

What I claim is:

A poppet valve tool for spring pressed valves in which the spring thrusts against the spring abutment on the valve stem, and the abutment has a laterally extending annular flange at its outer end and is held in position on the valve stem by lock members fitting in a conical recess in the abutment and having internal ribs interlocking in a groove in the valve stem, said tool comprising a rigid single piece head having a socket extending inwardly from the outer end thereof for receiving the end of the valve stem, the head being provided at its outer end around the socket with a pressure face of flat annular form and of a size for pressing against the flange of the spring abutment to depress the same, said socket having a lower cylindrical end section of a length and interior diameter to freely accommodate therein upper portions of the locking members when partially positioned in the recess of the abutment and when the outer end of the head is in engagement with the flange of the spring abutment, said socket also having a conical section converging inwardly and extending directly from the upper end of the cylindrical wall of said lower section for engaging the upper outer edges of the lock members and moving the latter axially along the valve stem into alignment with the groove therein and also tilting the same inwardly about the ribs thereof into interlocking engagement with the groove in the valve stem during 5 the axial operating movement of the head while the abutment is being depressed by the end of the head; the socket also including a counter bore portion at the apex of the conical portion of the socket for receiving the extreme outer end 10 of the valve stem.

NATHAN B, COOKI REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

